Safety-valve



W. F.. WALKER.

SAFETY VALVE.

' (No Model.)

No. 347,213.. Patented Au'g.. 1o, 1886.

Maude-5",

UNITED STATES To all whom, it may concern:

Be it known that I, XVILLIAM F. IVALKER, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new and useful Improvement in Safety-Valves, of which thefollowing is a full, clear, and exact description.

My invention relates to safety-valves of a new and simplifiedconstruction, so as to adapt them, by reason of their combinedcheapness, convenience, and efficiency, for many purposes for whichsafety-valves have hitherto been unavailable by reason of their cost,complication, and liability to derangement, and the necessity for skilland experience for their proper management. rJheir widest use and onefor which they are especially designed is as an attachment to what isknown as a water-back or apparatus for heating water for domesticpurposes affixed. to stoves or ranges and connected with thewater-service system, so that the water is heated before being drawn foruse. When the pipes are nn-v obstructed, an excess of pressure cannotoccur from leaving the water standing a considerable time in thewater-back, as the steam generated merely forces the water baclr in thepipes; but if the pipes should be obstructed from any cause, as theyfrequently are in winter by freezing, a rupture must necessarily occurwhich is always troublesome and expensive, and which very often resultsin destructive explosions.

The construction of my Valve will fully appear from the followingdescription, in connection with the accompanying drawings, in which-Figure l is a perspective view; Fig. 2,a section through y y, Fig. 1;and Figs. 3 and 4 transverse sections.

B, Fig. 1, is the case or body of the valve having the portion Hthreaded, in order-to attach it to the water-back or othersteamgenerator. 'Ihe upper portion of B is also threaded to fit thescrew-cap A. The interior is bored, as shown in the sectional view, fFig. 2, the upper part of the bore being enlarged sufficiently to affordfree play for the inclosed spring S, while at G abevel is formed as aseat for the valve F. The spindle E passes through a hole boredcentrally in the Application led December 10, 1885. Serial No. 185,298.

IVILLIAM F. IVALKER, OF CHICAGO, ILLINOIS.

SAFETY-VALVE.

SPECIFICATION forming part of Letters Patent No, 347,213, dated August10l 1886.

(No model.)

D D. These slots may be of such shape that the escaping steam willproduce a sound sufficient to call attention to the excessive pressure.These slots are so located that they-allow a view of the interior, andthus any derangement can more easily be seen, and any dirt,incrustation, or rust may be removed by an instrument inserted at thispoint without the necessity of taking the valve apart. This valve, beingintended only for a reliefvalve, is constructed without any stuffing-boxsurrounding the valve-stem. The point at which the valve will rise willof course be determined by the amount of compression of the spring, andthis may be varied by screwing or unscrewing the cap A, the pressurecorresponding to any degree of compression, being marked on the attenedface O, Fig. 1. By properly proportioning the area of valveseat G tostrength of spring S and pitch of screw I, the graduations may be madeto correspond with the bases or tops of said screw, thus affording avery easy method of marking said graduations.

I am aware that safety-valves have been made which were kept on theirseats by the direct action of a spring; also, that the pressure of suchsprings has been regulated by an adjusting-screw, and also that thepressureV necessary to raise a safety-valve has been indicated by agraduated scale; but I am not aware that these features have all beencombinedin l so simple and convenient a manner as in my invention andwith so few and easily-made parts.

I claim- 1. The combination of the valve and stem F E with thedirect-acting spring S, the external cap, A, and the tubular body B,having within itthe valve-seat G, and above said seat the slots D D, allconstructedas and for the purpose set forth.

IOO

2. The Combination of the valve and stem sou desired, all constructedand combined as F E with the direct-acting spring S, the eX- and for thepurpose set forth.

termal cap A and the tubular body B havw j, 1

ing the vaylveseab G, and having its lpper VILLTAM F' ALKILR' 5 portionslotted for the free escape of steam VitnesseS:

and its exterior graduated to indicate the re- J. I. VEEDER,

Sistance of the spring at any given point ofteu- P. H. T. MASON.

